I really don't see the point of that kind of problems where you can't use Matlab built-in functions.
Make a checkerboard matrix
Remove the two elements next to NaN value
Rotate input square matrix 90 degrees CCW without rot90
02 - Vector Variables 4
Is this triangle right-angled?
Return unique values without sorting
Convert a numerical matrix into a cell array of strings
Convert a structure into a string
Fill a zeros matrix
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